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SLI not working

Last response: in Graphics & Displays
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July 27, 2010 6:57:56 AM

I recently tryed to put my 9800GTs in SLI and for some reason whenever there in SLI i get tearing and sometimes the hole screen will go red for about 3 seconds. The screen only go's red if i have an explosion effect close by my character. I have tryed the graphics cards by themselves i've also tryed them in diffrent slots the problem only accurse if there in SLI with each other. I tryed like 5 diffrent nvidia driver versions and none of them fix the problem. Any help would be greatly appreciated.

More about : sli working

a b Î Nvidia
a c 169 U Graphics card
July 27, 2010 7:00:35 AM

Post your full system specs,also does it happen in other games too ?
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July 27, 2010 7:40:29 AM

It happens in all games.

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System Information
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Time of this report: 7/27/2010, 03:38:30
Machine name: HOME-MK4RQ
Operating System: Windows 7 Professional 64-bit (6.1, Build 7600) (7600.win7_gdr.100226-1909)
Language: English (Regional Setting: English)
System Manufacturer: MSI
System Model: MS-7612
BIOS: Default System BIOS
Processor: AMD Phenom(tm) II X4 955 Processor (4 CPUs), ~3.2GHz
Memory: 8192MB RAM
Available OS Memory: 8192MB RAM
Page File: 1799MB used, 6390MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 32bit Unicode
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a b Î Nvidia
a c 169 U Graphics card
July 27, 2010 8:21:46 AM

Turn ON V-sync and see if it helps,also when you installed different drivers,did you do a clean install of each ? (with driver sweeper)
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July 27, 2010 8:33:50 AM

I tryed v-sync it doesn't work. And it was a fresh install i had just reinstalled the OS.
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July 27, 2010 9:45:46 AM

what are the temps of ur GPU's while gaming
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July 27, 2010 11:40:04 AM

one's running 56C the other runs 46C but there fans are only at 35%. I also noticed that GPU2 seems to be running at reduced clock speed and memory speed shader speed is also very low.
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July 27, 2010 12:01:10 PM

I reread your post and noticed you said while in game. So i played fallout 3 and noticed the GPU reachs 70C easy and the drivers only increase the fan to 50% so they stay around 70C. Also i played fallout 3 in window mode and i didn't get any tearing but the game did lag alot plus now my screen flickers.
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a b Î Nvidia
a c 169 U Graphics card
July 27, 2010 5:48:13 PM

Do both cards work completely fine simultaneously ? haven't you noticed any problems ?
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July 28, 2010 8:37:02 AM

They work fine by themselves if there in SLI they have major issues rendering just about anything. When not in SLI or when only one card is installed they work fine. Seeing as how my issue is only when there in SLI i'm thinking the SLI bridge that came with my motherboard is broken. As for the clocks on GPU2 it seems that the drivers are decreasing and increaseing GPU2's clock speeds at will i don't know if this is normal for SLI. At any given time GPU2 is almost always running at 50% clock speeds i do not understand why as it would seem to defeat the purpose of haveing 2 cards installed if one runs at 50% less performance.
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a b Î Nvidia
a c 169 U Graphics card
July 28, 2010 12:24:22 PM

When you try the cards in single mode,do you put both of them in the same PCI-E slot ? or have you tested both PCI-E slots ?
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July 28, 2010 12:40:43 PM

Its an MSI board it says in the manual that if you use only one graphics card it must be in the first PCI-E slot in order to work. So i can only test them in the PCI-E2 slot when there by them self. I have 3 PCI-E slots they have only been tested on PCI-E2 the very top PCI-E slot.
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July 28, 2010 1:27:09 PM

I went in and tested all the slots and they all worked fine. Still haveing the same issues it has to be the bridge because i can't find anything wrong with the hardware.
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July 28, 2010 2:21:29 PM

try using the old drivers
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July 28, 2010 2:34:37 PM

I took the bridge off and it works fine control panel says its still in SLI just not running at optimal settings. And i tryed the old drivers they don't work.
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